I belive you meen ns not ms. Lets say you use a 60 or 66Mhz crystal all will be overclocked, not just the CPU so 60ns RAM is a must, perhaps even faster. Extra cooling is needed on the CPU and FPU or they will fry. I don't think the SCSI module like an overclocked card but I can be wrong in this.
When all is done you might get another 1 or 2 mips out of the machine and to what cost? shorter lifespan and a card that needs modding of the desktop in order to fit aswell as the risk of something going wrong.
I say if you need more power then go for a better card rather than overclocking what you got, if it was a 060card with the obviously lack of any better 68K CPU on the market then I would understand but not a 030. A secondhand 040/25Mhz card is quite cheap and would give you some real speed increase, and B1230 IV still sell for quite a bit due to it's high quality so you might not have to put as much money into the upgrade as you think.
